This security restriction is to avoid cross-site scripting attacks (XSS).

这个安全限制是为了避免跨站点脚本攻击(XSS)。

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The SOP is a security restriction that basically forbids a page loaded from a certain origin (meaning the protocol/host/port trio of the URL) to access data from a different origin.

SOP 是一种安全性约束，它实际上禁止从某个源（即 URL 的协议/主机/端口三元组）装载的页面访问来自不同源的数据。

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This should only work if the client and the server are on the same machine, and no special restriction logic is implemented in the customized security plug-ins.

此操作仅当客户机和服务器处于同一个机器上时才能进行，且在定制的安全性插件中没有执行任何特殊的限制逻辑。

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The administration could get around the restriction by issuing a national security waiver through the Pentagon, something it hasn't done so far.

NPR: Gitmo Closure Elusive, Obama Looks At Other Steps

However, Big Brother Watch says some public bodies may be sidestepping that restriction by sub-contracting the work to private security companies.

BBC: Public bodies 'spending millions to snoop'

"I made it very clear that the one piece of hand luggage restriction which applies to customers departing the UK and transferring through the UK has no security justification, " said BA's chief executive Willie Walsh.

BBC: Airport security measures